Bullying has long been researched in different communities and cultures and has proven to be a phenomenon that seriously endangers individuals and communities as well. Among its consequences are different psychosomatic symptoms, deteriorating study or work performance, depression, suicidal ideation, unhealthy social climate or acts of crime. The present study presents some of the findings of a research carried out in 24 schools of Hajdú-Bihar County in 2008. The 1006 large sample of 5th and 7th grade students (age 11 and 13) answered questions on their bullying-related experiences and attitudes. Data were collected in a questionnaire on types of bullying, prevalence, students’ mood, feeling of well-being and their social environment. Findings show that similarly to results of earlier research a large number of students are involved in bullying. In the sample the most common types are name-calling and ostracism, whereas beating and threatening are less frequent. Correlations with age, gender and academic performance show that the younger age-group is more involved in beating and spreading gossip, girls in relational bullying, and academically weaker students are most often involved in bullying events. Variables of mood, feelings of well-being, social and study climate are analyzed with a focus on studying correlations between feelings and relations within the smaller communities. Victims appear to be in the worst position on all measures, including number of friends, stress, emotions towards school or social climate. However, they show a more positive attitude for studying than bullies or bully-victims.